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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21502] $group using index</title>
                <link>https://jira.mongodb.org/browse/SERVER-21502</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be great for a $group stage to use indexes for easy group.&lt;/p&gt;

&lt;p&gt;For example, this aggregation&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    $group: {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    $sort: {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    $limit: 10&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;is not using the &quot;media&quot; index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="239809">SERVER-21502</key>
            <summary>$group using index</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="bappr">Benjamin Appr&#233;derisse</reporter>
                        <labels>
                    </labels>
                <created>Tue, 17 Nov 2015 16:40:41 +0000</created>
                <updated>Tue, 17 Nov 2015 21:12:05 +0000</updated>
                            <resolved>Tue, 17 Nov 2015 18:57:43 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1091017" author="bappr" created="Tue, 17 Nov 2015 21:12:05 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;Indeed, this looks like a duplicate ticket.&lt;br/&gt;
I will follow the other one.&lt;/p&gt;

&lt;p&gt;Thanks. &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="1090835" author="charlie.swanson" created="Tue, 17 Nov 2015 18:57:35 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bappr&quot; class=&quot;user-hover&quot; rel=&quot;bappr&quot;&gt;bappr&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;This is a totally valid request, and something we should absolutely do in the future. We already have &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4507&quot; title=&quot;aggregation:  optimize $group to take advantage of sorted sequences&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4507&quot;&gt;SERVER-4507&lt;/a&gt; open which I believe is asking for the same thing, or something that would also solve your use case. If not, please re-open this ticket and describe the differences. If that does sound similar, please follow that ticket to track our progress.&lt;/p&gt;

&lt;p&gt;I&apos;ll close this as a duplicate, but as I said, feel free to re-open if you think it is not.&lt;/p&gt;</comment>
                            <comment id="1090740" author="ramon.fernandez" created="Tue, 17 Nov 2015 17:57:57 +0000"  >&lt;p&gt;This looks like the same issue as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21471&quot; title=&quot;Bad index selection on aggregate with $match + $sort&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21471&quot;&gt;&lt;del&gt;SERVER-21471&lt;/del&gt;&lt;/a&gt;, which is being investigated. What version of MongoDB are you using? Have you tried with the latest release candidate, 3.2.0-rc2?&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="26715">SERVER-4507</issuekey>
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            <issuekey id="239503">SERVER-21471</issuekey>
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